Abstract

In the field of FM-CW tropospheric radar, new breakthroughs have become possible due to progress in FM-CW radar hardware, in FM-CW radar signal processing and in the availability of the Doppler polarimetric FM-CW radar DARR. DARR has a high resolution in range, Doppler and polarization. Doppler resolution of a few centimeters per second combined with a maximum Doppler range of ±9 meters per second can be obtained. Two mechanical polarizers, located directly behind the center feeds of the transmit and receive antenna, are employed, operating over polarization angles or ±90 degrees. Measured Doppler and polarimetric reflectivity profiles are shown. The melting process during stratiform rain and the raindrop size distribution have been modeled and verified, based on these profiles.

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